LookUpEdit Class

A lookup editor.

Namespace: DevExpress.Xpf.Grid.LookUp

Assembly: DevExpress.Xpf.Grid.v24.2.dll

NuGet Package: DevExpress.Wpf.Grid.Core

Declaration

C#

public class LookUpEdit :
    LookUpEditBase

VB.NET

Public Class LookUpEdit
    Inherits LookUpEditBase

Remarks

LookUpEdit is a multi-column combo box that uses an embedded GridControl to implement the lookup functionality.

Tip

The LookUpEdit class inherits its features from the LookUpEditBase class.

Refer to the LookUpEditBase class description for information on derived features and API.

Create a LookupEdit

The LookUpEdit cannot operate without a data source. The editor can be bound to any object that implements the IEnumerable interface or its descendant (for example, IList, ICollection).

To bind the editor to a data source, use its LookUpEditBase.ItemsSource property. The LookUpEditBase.DisplayMember and LookUpEditBase.ValueMember properties specify the field names in a data source that supply display strings and item values, respectively.

Note

The ValueMember property should refer to a data property that contains unique values.

If the ValueMember property is not specified, the editor’s BaseEdit.EditValue property returns the entire data object that corresponds to the selected item.

The example below demonstrates how to bind the LookUpEdit editor to data.

C#

using System;
using System.Collections.Generic;
using System.Windows;

namespace LookupEditDemo {
    public partial class MainWindow : Window {
        public MainWindow() {
            InitializeComponent();
        }
    }

    public class Customer {
        public int Id { get; set; }
        public string Name { get; set; }
        public string City { get; set; }
        public int Visits { get; set; }
        public DateTime? Birthday { get; set; }
    }

    public class MainWindowViewModel {
        public MainWindowViewModel() {
            ObservableCollection<Customer> people = new ObservableCollection<Customer>();
            people.Add(new Customer() { Id = 1, Name = "Gregory S. Price", City = "Hong Kong", Visits = 4, Birthday = new DateTime(1980, 1, 1) });
            people.Add(new Customer() { Id = 2, Name = "Irma R. Marshall", City = "Madrid", Visits = 2, Birthday = new DateTime(1966, 4, 15) });
            people.Add(new Customer() { Id = 3, Name = "John C. Powell", City = "Los Angeles", Visits = 6, Birthday = new DateTime(1982, 3, 11) });
            people.Add(new Customer() { Id = 4, Name = "Christian P. Laclair", City = "London", Visits = 11, Birthday = new DateTime(1977, 12, 5) });
            people.Add(new Customer() { Id = 5, Name = "Karen J. Kelly", City = "Hong Kong", Visits = 8, Birthday = new DateTime(1956, 9, 5) });
            people.Add(new Customer() { Id = 6, Name = "Brian C. Cowling", City = "Los Angeles", Visits = 5, Birthday = new DateTime(1990, 2, 27) });
            people.Add(new Customer() { Id = 7, Name = "Thomas C. Dawson", City = "Madrid", Visits = 21, Birthday = new DateTime(1965, 5, 5) });
            people.Add(new Customer() { Id = 8, Name = "Angel M. Wilson", City = "Los Angeles", Visits = 8, Birthday = new DateTime(1987, 11, 9) });
            people.Add(new Customer() { Id = 9, Name = "Winston C. Smith", City = "London", Visits = 1, Birthday = new DateTime(1949, 6, 18) });
            people.Add(new Customer() { Id = 10, Name = "Harold S. Brandes", City = "Bangkok", Visits = 3, Birthday = new DateTime(1989, 1, 8) });
            people.Add(new Customer() { Id = 11, Name = "Michael S. Blevins", City = "Hong Kong", Visits = 4, Birthday = new DateTime(1972, 9, 14) });
            people.Add(new Customer() { Id = 12, Name = "Jan K. Sisk", City = "Bangkok", Visits = 6, Birthday = new DateTime(1989, 5, 7) });
            people.Add(new Customer() { Id = 13, Name = "Sidney L. Holder", City = "London", Visits = 19, Birthday = new DateTime(1971, 10, 3) });
            Customers = people;
        }
        public ObservableCollection<Customer> Customers { get; private set; }
    }
}

VB.NET

Imports System
Imports System.Collections.Generic
Imports System.Windows

Namespace LookupEditDemo
    Public Partial Class MainWindow
        Inherits Window

        Public Sub New()
            InitializeComponent()
        End Sub
    End Class

    Public Class Customer
        Public Property Id As Integer
        Public Property Name As String
        Public Property City As String
        Public Property Visits As Integer
        Public Property Birthday As Date?
    End Class

    Public Class MainWindowViewModel
        Private _Customers As System.Collections.Generic.ObservableCollection(Of LookupEditDemo.Customer)

        Public Sub New()
            Dim people As ObservableCollection(Of Customer) = New ObservableCollection(Of Customer)()
            people.Add(New Customer() With {
                .Id = 1,
                .Name = "Gregory S. Price",
                .City = "Hong Kong",
                .Visits = 4,
                .Birthday = New DateTime(1980, 1, 1)
            })
            people.Add(New Customer() With {
                .Id = 2,
                .Name = "Irma R. Marshall",
                .City = "Madrid",
                .Visits = 2,
                .Birthday = New DateTime(1966, 4, 15)
            })
            people.Add(New Customer() With {
                .Id = 3,
                .Name = "John C. Powell",
                .City = "Los Angeles",
                .Visits = 6,
                .Birthday = New DateTime(1982, 3, 11)
            })
            people.Add(New Customer() With {
                .Id = 4,
                .Name = "Christian P. Laclair",
                .City = "London",
                .Visits = 11,
                .Birthday = New DateTime(1977, 12, 5)
            })
            people.Add(New Customer() With {
                .Id = 5,
                .Name = "Karen J. Kelly",
                .City = "Hong Kong",
                .Visits = 8,
                .Birthday = New DateTime(1956, 9, 5)
            })
            people.Add(New Customer() With {
                .Id = 6,
                .Name = "Brian C. Cowling",
                .City = "Los Angeles",
                .Visits = 5,
                .Birthday = New DateTime(1990, 2, 27)
            })
            people.Add(New Customer() With {
                .Id = 7,
                .Name = "Thomas C. Dawson",
                .City = "Madrid",
                .Visits = 21,
                .Birthday = New DateTime(1965, 5, 5)
            })
            people.Add(New Customer() With {
                .Id = 8,
                .Name = "Angel M. Wilson",
                .City = "Los Angeles",
                .Visits = 8,
                .Birthday = New DateTime(1987, 11, 9)
            })
            people.Add(New Customer() With {
                .Id = 9,
                .Name = "Winston C. Smith",
                .City = "London",
                .Visits = 1,
                .Birthday = New DateTime(1949, 6, 18)
            })
            people.Add(New Customer() With {
                .Id = 10,
                .Name = "Harold S. Brandes",
                .City = "Bangkok",
                .Visits = 3,
                .Birthday = New DateTime(1989, 1, 8)
            })
            people.Add(New Customer() With {
                .Id = 11,
                .Name = "Michael S. Blevins",
                .City = "Hong Kong",
                .Visits = 4,
                .Birthday = New DateTime(1972, 9, 14)
            })
            people.Add(New Customer() With {
                .Id = 12,
                .Name = "Jan K. Sisk",
                .City = "Bangkok",
                .Visits = 6,
                .Birthday = New DateTime(1989, 5, 7)
            })
            people.Add(New Customer() With {
                .Id = 13,
                .Name = "Sidney L. Holder",
                .City = "London",
                .Visits = 19,
                .Birthday = New DateTime(1971, 10, 3)
            })
            Customers = people
        End Sub

        Public Property Customers As ObservableCollection(Of Customer)
            Get
                Return _Customers
            End Get
            Private Set(ByVal value As ObservableCollection(Of Customer))
                _Customers = value
            End Set
        End Property
    End Class
End Namespace

Xaml

<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:LookupEditDemo"
        xmlns:dxg="http://schemas.devexpress.com/winfx/2008/xaml/grid" 
        x:Class="LookupEditDemo.MainWindow"
        Title="MainWindow" Height="450" Width="800">
    <Window.DataContext>
        <local:MainWindowViewModel/>
    </Window.DataContext>
    <Grid>

        <dxg:LookUpEdit
            HorizontalAlignment="Left"
            VerticalAlignment="Top"
            Width="150"  
            ItemsSource="{Binding Customers}"
            DisplayMember="Name"
            ValueMember="Id"/>

    </Grid>
</Window>

The image below illustrates the result.

The editor automatically generates columns for all the bound data object’s public properties. If you create columns manually for the embedded grid, set the AutoPopulateColumns property to false to disable automatic column generation. Otherwise, the LookupEdit substitutes your columns with the automatically generated ones.

Editor Value

Use the BaseEdit.EditValue property to get the editor’s value. The TextEditBase.Text property gets the text displayed within the lookup editor’s text box.

To respond to editor value changes, handle the BaseEdit.EditValueChanged event. To validate the new value, handle the BaseEdit.Validate event.

View Example: WPF LookUpEdit - Process New Values

Customize the Edit Box

The EditTemplate property allows you to define the edit box appearance. The EditNonEditableTemplate property specifies the editor template if you set the IsTextEditable property to false:

XAML

<dxg:LookUpEdit ItemsSource="{Binding Products}"
                DisplayMember="ProductName"
                ValueMember="ID"
                IsPopupAutoWidth="False"
                IsTextEditable="False"
                ShowBorder="False"
                ShowEditorButtons="False">
    <dxg:LookUpEdit.EditNonEditableTemplate>
        <ControlTemplate>
            <Border BorderBrush="Orange" BorderThickness="3" CornerRadius="7">
                <StackPanel Orientation="Horizontal">
                    <TextBlock Margin="2" 
                               VerticalAlignment="Center" 
                               Foreground="Gray" 
                               Text="Product:"/>
                    <TextBlock Text="{Binding Path=(dxe:BaseEdit.OwnerEdit).SelectedItem.ProductName, 
                                              RelativeSource={RelativeSource Self}}"
                               VerticalAlignment="Center"/>
                </StackPanel>
            </Border>
        </ControlTemplate>
    </dxg:LookUpEdit.EditNonEditableTemplate>
</dxg:LookUpEdit>

Embedded GridControl

The GetGridControl() method returns a data grid embedded in the editor’s drop-down window.

To manually customize a data grid and embed it within the look-up editor, use the PopupBaseEdit.PopupContentTemplate property.

This example shows how to customize the GridControl displayed in the LookUpEdit‘s popup window.

1. Set the LookUpEdit.AutoPopulateColumns property to false.
2. Use the PopupBaseEdit.PopupContentTemplate property to specify a custom GridControl.
3. Set the GridControl‘s name to PART_GridControl.

View Example: LookUpEdit - Customize the Embedded GridControl

XAML

<dxg:LookUpEdit Name="lookUpEdit1"
                DisplayMember="ProductName"
                ValueMember="ID"
                AutoPopulateColumns="False"
                AutoComplete="True"
                IncrementalFiltering="True"
                ImmediatePopup="True"
                IsPopupAutoWidth="False">
    <dxg:LookUpEdit.PopupContentTemplate>
        <ControlTemplate>
            <dxg:GridControl Name="PART_GridControl">
                <dxg:GridControl.Columns>
                    <dxg:GridColumn FieldName="ProductName"/>
                    <dxg:GridColumn FieldName="UnitPrice"/>
                    <dxg:GridColumn FieldName="Quantity"/>
                </dxg:GridControl.Columns>
                <dxg:GridControl.View>
                    <dxg:TableView AutoWidth="True"/>
                </dxg:GridControl.View>
            </dxg:GridControl>
        </ControlTemplate>
    </dxg:LookUpEdit.PopupContentTemplate>
</dxg:LookUpEdit>

C#

using System.Windows;

namespace HowToCreateLookUpEdit {
    public partial class MainWindow : Window {
        public MainWindow() {
            InitializeComponent();
            lookUpEdit1.ItemsSource = new ProductList();
        }
    }
}

VB.NET

Imports System.Windows

Namespace HowToCreateLookUpEdit
    Partial Public Class MainWindow
        Inherits Window
        Public Sub New()
            InitializeComponent()
            lookUpEdit1.ItemsSource = New ProductList()
        End Sub
    End Class
End Namespace

The embedded GridControl is not serialized. To change this behavior, set the attached DXSerializer.Enabled property to true for the GridControl.

Operation Modes

You can fine-tune a lookup editor by using the BaseEdit.StyleSettings property. This property allows you to alter the appearance and behavior of a lookup editor by adding extra features like searching and multiple item selection. To apply specific settings, assign the lookup’s BaseEdit.StyleSettings property to one of the objects listed in the table below.

LookUpEdit mode	Corresponding settings object	Description
LookUpEdit	LookUpEditStyleSettings	Editor’s dropdown displays a grid. This is a default setting.
SearchLookUpEdit	SearchLookUpEditStyleSettings	Editor’s dropdown displays a grid and a search box.
MultiSelectLookUpEdit	MultiSelectLookUpEditStyleSettings	Editor’s dropdown displays a grid that allows you to select multiple items.
TokenLookUpEdit	TokenLookUpEditStyleSettings	Editor’s dropdown displays a grid that allows you to select multiple items. Selected items appear as tokens.
SearchTokenLookUpEdit	SearchTokenLookUpEditStyleSettings	Editor’s dropdown displays a grid and a search box. Allows multiple item selection. Selected items appear as tokens.

Each of the settings objects has a number of properties that you can use to enable or disable the following grid features.

• Filtering (using the LookUpEditStyleSettings.AllowColumnFiltering property)
• Grouping (using the LookUpEditStyleSettings.AllowGrouping property)
• Sorting (using the LookUpEditStyleSettings.AllowSorting property)

The following code example shows a lookup editor in SearchLookUp mode with the grouping feature disabled:

XAML

<dxg:LookUpEdit>
    <dxg:LookUpEdit.StyleSettings>
        <dxg:SearchLookUpEditStyleSettings AllowGrouping="False"/>
    </dxg:LookUpEdit.StyleSettings>
</dxg:LookUpEdit>

The following sections describe different settings provided by the LookUpEdit control in detail.

LookUpEdit Operation Mode

LookUpEdit mode is used by default.

The editor’s dropdown displays a fully-functional grid that supports the following features:

• Single item selection
• Data filtering
• Data grouping
• Data sorting

To learn more, see LookUpEditStyleSettings.

SearchLookUpEdit Operation Mode

In addition to LookUpEdit features, SearchLookUpEdit displays a search box.

To learn more, see SearchLookUpEditStyleSettings.

MultiSelectLookUpEdit Operation Mode

In addition to the standard features, MultiSelectLookUpEdit supports multiple item selection.

To learn more, see MultiSelectLookUpEditStyleSettings.

TokenLookUpEdit Operation Mode

TokenLookupEdit mode is inspired by modern mail clients.

In addition to the standard features, TokenLookupEdit supports the following:

• Multiple item selection
• Selected items appear as tokens

To learn more, see TokenLookUpEditStyleSettings.

SearchTokenLookUpEdit Operation Mode

SearchTokenLookupEdit mode is inspired by modern mail clients.

In addition to LookUpEdit features, SearchTokenLookupEdit supports the following:

• Data search
• Multiple item selection
• Selected items appear as tokens

To learn more, see SearchTokenLookUpEditStyleSettings.

LookUpEdit Operation Mode Comparison

The table below compares the features of different LookUpEdit operation modes.

	Grouping	Filtering	Sorting	Single Item Selection	Multiple Item Selection[1]	Search	Tokens	Text Editing
LookUpEdit
SearchLookUpEdit
MultiselectLookUpEdit
TokenLookUpEdit
SearchTokenLookUpEdit

Examples

• WPF LookUpEdit - Customize the Embedded Data Grid
• WPF LookUpEdit - Display a TreeList as Popup Content
• WPF LookUpEdit - Process New Values
• WPF LookUpEdit - Filter by Multiple Columns
• WPF LookUpEdit - Enable Multiple Selection Mode
• WPF LookUpEdit - Display CheckBoxes for Multiple Selection Mode

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the LookUpEdit class.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

XAML

wpf-lookupedit-display-treelist-as-popup-content/CS/CustomTreeViewComboBox/MainWindow.xaml#L7

<Grid>
    <dxg:LookUpEdit Name="lookUpEdit" VerticalAlignment="Top" Width="350" Margin="50,37,67,0" DisplayMember="Name">
        <dxg:LookUpEdit.PopupContentTemplate>

wpf-lookupedit-process-new-values/CS/HowToCreateLookUpEdit/MainWindow.xaml#L30

<Grid>
    <dxg:LookUpEdit x:Name="lookUpEdit" Width="200"
                    ItemsSource="{Binding Products}"

wpf-data-grid-filter-column-lookupedit-based-on-value-in-another-column/CS/MainWindow.xaml#L25

<DataTemplate>
    <dxg:LookUpEdit Name="PART_Editor"
                    ItemsSource="{Binding View.DataContext.Cities}" AutoPopulateColumns="False"

wpf-lookupedit-filter-by-multiple-columns/CS/MainWindow.xaml#L8

<StackPanel>
    <dxg:LookUpEdit
        x:Name="lookUpEdit" Width="290"

Inheritance

Show 14 items

Object

DispatcherObject

DependencyObject

Visual

UIElement

FrameworkElement

Control

BaseEdit

TextEditBase

TextEdit

ButtonEdit

PopupBaseEdit

LookUpEditBase

LookUpEdit

Footnotes

1. Refer to the following help topic for more information: Multiple Selection in ComboBoxEdit, LookUpEdit, and ListBoxEdit.